Cake Servings by Pan Size Calculator
Cake servings by pan size calculator: enter pan diameter or dimensions to see how many people your cake serves. Chart for round, square and sheet pans (Wilton).
- Data verified · July 2026
- Edited by Martín Rodríguez
- Formula verified by automated tests
- Private — runs on your device
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How to use this calculator
Follow this tool’s steps, then review its formula, assumptions, and limits below.
When to use this calculator
- Planning how many cakes to bake for a 50-person birthday party with 24 cm pans.
- Deciding between a 28×28 cm square pan or two 22 cm round pans to get more servings.
- Sizing a wedding cake order for 80 guests using the formal wedding portion standard.
- Calculating the minimum pan size for 15 kids at a children's birthday party with smaller portions.
Official Wilton Round Cake Serving Chart (by pan diameter)
Wilton's authoritative party and wedding serving counts for standard round pan sizes — the numbers most cake charts cite.
| Round pan size | Diameter (cm) | Party servings (1½" × 2" slice) | Wedding servings (1" × 2" slice) |
|---|---|---|---|
| 6 in. | 15 cm | 12 | 12 |
| 8 in. | 20 cm | 20 | 24 |
| 9 in. | 23 cm | 24 | 32 |
| 10 in. | 25 cm | 28 | 38 |
| 12 in. | 30 cm | 40 | 56 |
| 14 in. | 36 cm | 63 | 78 |
| 16 in. | 41 cm | 77 | 100 |
Source: Wilton — Ultimate Cake Serving Chart (wilton.com), the world baking-industry standard. Values are for cakes 3–6 in. (≈8–15 cm) tall; a cake shorter than 3 in. yields about half. Party slice ≈ 1½" × 2"; wedding slice ≈ 1" × 2". Wilton's published counts use a fixed cutting pattern, so they can differ slightly from a pure surface-area calculation.
Standard Slice Footprints — Wilton Industry Standard
| Occasion | Slice size | Footprint area (cm²) | Servings from 24 cm round (452 cm²) | Servings from 30 cm round (707 cm²) |
|---|---|---|---|---|
| Party / Birthday | 1.5" × 2" (3.8 × 5 cm) | 19.4 | 24 | 56 |
| Wedding / Formal | 1" × 2" (2.5 × 5 cm) | 12.9 | 32 | 72 |
Fuente: Wilton – Ultimate Cake Serving Chart (wilton.com). Los valores de porciones provienen directamente de la tabla oficial de Wilton (método de corte en anillos), no de la simple división de área superficial. El molde de 24 cm (~9") rinde 24 party / 32 wedding; el de 30 cm (~12") rinde 56 party / 72 wedding. La altura de la torta no afecta el conteo SOLO si está entre 3 y 6 pulgadas; tortas de menos de 3" rinden la mitad. La categoría "Kids' Party" (1"×1.5") no forma parte del estándar Wilton.
How it works
How many servings does a cake give? Quick reference chart
Round pans — servings by diameter
| Diameter | Area (cm²) | Party servings | Wedding servings | Kids' servings |
|---|---|---|---|---|
| 18 cm | 254 | 13 | 20 | 27 |
| 20 cm | 314 | 17 | 25 | 33 |
| 22 cm | 380 | 20 | 30 | 40 |
| 24 cm | 452 | 24 | 35 | 47 |
| 26 cm | 531 | 28 | 42 | 55 |
| 28 cm | 616 | 32 | 48 | 64 |
| 30 cm | 707 | 37 | 55 | 73 |
| 35 cm | 962 | 50 | 75 | 100 |
Square pans — servings by side
| Side | Area (cm²) | Party servings | Wedding servings | Kids' servings |
|---|---|---|---|---|
| 20 cm | 400 | 21 | 31 | 42 |
| 24 cm | 576 | 30 | 45 | 60 |
| 28 cm | 784 | 41 | 61 | 81 |
| 30 cm | 900 | 47 | 70 | 93 |
> Key insight: Square pans yield up to 27% more servings than round pans of the same labeled size, because there is no curved-edge waste when cutting.
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How it works
The baking industry (Wilton, Webstaurantstore) uses the surface area method to count servings: each cut produces a slice whose base has a standard footprint area. The cake's height does not affect serving count — it only determines how tall each individual slice is.
Formula by pan shape
# ROUND
Area (cm²) = π × (diameter / 2)²
# SQUARE
Area (cm²) = side × side
# RECTANGULAR
Area (cm²) = length × width
# SERVINGS (any shape)
Servings = Area ÷ Slice_footprintStandard slice footprints (Wilton industry standard)
| Occasion | Slice size | Area (cm²) |
|---|---|---|
| Party/birthday | 1.5" × 2" (3.8 × 5 cm) | 19.4 cm² |
| Wedding/formal | 1" × 2" (2.5 × 5 cm) | 12.9 cm² |
| Kids' party | 1" × 1.5" (2.5 × 3.8 cm) | 9.7 cm² |
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Common mistakes
1. Thinking a taller cake gives more servings. The number of cuts on the surface doesn't change. A 4-layer and a 2-layer 24 cm cake both yield 24 party servings — the layers just make each slice taller.
2. Using the outside pan diameter instead of the inside. Metal edges can reduce usable diameter by 1–2 cm. Always measure the inside of the pan.
3. Mixing up party and wedding portion sizes. Wedding portions (1" × 2") are 33% smaller than party portions (1.5" × 2"). Using the wrong size can leave guests without cake at a formal event.
4. Not adding tiered cakes separately. For a two-tier cake with different diameters, calculate each tier's area independently and add them.
5. Forgetting the safety margin. Always plan 10–15% extra: the first few slices tend to be uneven, and some guests may ask for seconds.
26 cm round cake — adult birthday party
Frequently asked questions
How many servings does a 24 cm (9.5-inch) round cake yield?
How many servings does a 9-inch (23 cm) round cake yield?
Does a taller cake yield more servings?
What cake size do I need for 30 people?
What is the difference between party and wedding portions?
Does a square pan yield more servings than a round pan of the same size?
How do I calculate servings for a tiered cake?
How small should kids' birthday cake portions be?
Should I add a safety margin to my serving count?
Sources & references
Methodology & trust
Cooking calculator with its formula verified automatically against Wilton – Ultimate Cake Serving Chart (world baking industry standard), per our editorial policy and methodology.
Updated: July 2026. Parameters are verified periodically against the cited sources.
Calculations run 100% in your browser. We do not store or transmit your data.
Indicative results. For critical decisions, consult a professional.
Rodríguez, M. (2026). Cake Servings by Pan Size Calculator. Hacé Cuentas. https://hacecuentas.com/en/birthday-cake-servings-calculator
Content licensed under CC-BY 4.0 — reuse it citing the source with a link to Hacé Cuentas.